Method and Device for Transmitting/Receiving Digital Broadcast Signal

1. A method for transmitting a broadcast signal, comprising: encoding service data for a service, wherein the service data comprises a first video stream and a second video stream; generating signaling data for the service, wherein the signaling data comprises first information indicating whether the service is a 2 dimensional (2D) service or a 3 dimensional (3D) service; and transmitting the broadcast signal comprising the service data and the signaling data, wherein signaling the signaling data precedes an actual switching from a dual video stream to a single video stream in a case of switching from the 3D service to the 2D service.

2. The method of claim 1 , wherein signaling the signaling data takes place after an actual switching of a stream structure from the single video stream to the dual video stream in a case of switching from the 2D service to the 3D service.

3. The method of claim 1 , wherein the signaling data further includes mode information indicating a type of the 3D service, wherein the type of the 3D service is one of a Frame compatible stereoscopic 3D service and a Service compatible stereoscopic 3D service.

4. The method of claim 1 , wherein one of the first video stream and the second video stream is a base video stream, wherein the signaling data further includes LR information indicating that the base video stream is a left view video stream.

5. A device for transmitting a broadcast signal, comprising: an encoder configured to encode service data for a service, wherein the service data comprises a first video stream and a second video stream; a signaling data processor configured to generate signaling data for the service, wherein the signaling data comprises first information indicating whether the service is a 2 dimensional (2D) service or a 3 dimensional (3D) service; and a transmitter configured to transmit the broadcast signal comprising the service data and the signaling data, wherein signaling the signaling data precedes an actual switching from a dual video stream to a single video stream in a case of switching from the 3D service to the 2D service.

6. The device of claim 5 , wherein signaling the signaling data takes place after an actual switching of a stream structure from the single video stream to the dual video stream in a case of switching from the 2D service to the 3D service.

7. The device of claim 5 , wherein the signaling data further includes mode information indicating a type of the 3D service, wherein the type of the 3D service is one of a Frame compatible stereoscopic 3D service and a Service compatible stereoscopic 3D service.

8. The device of claim 5 , wherein one of the first video stream and the second video stream is a base video stream, wherein the signaling data further includes LR information indicating that the base video stream is a left view video stream.